// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2016
// Mehdi Goli    Codeplay Software Ltd.
// Ralph Potter  Codeplay Software Ltd.
// Luke Iwanski  Codeplay Software Ltd.
// Contact: <eigen@codeplay.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#define EIGEN_TEST_NO_LONGDOUBLE
#define EIGEN_TEST_NO_COMPLEX

#define EIGEN_DEFAULT_DENSE_INDEX_TYPE int64_t
#define EIGEN_USE_SYCL

#include "main.h"
#include <unsupported/Eigen/CXX11/Tensor>

using Eigen::Tensor;

// Inflation Definition for each dimension the inflated val would be
//((dim-1)*strid[dim] +1)

// for 1 dimension vector of size 3 with value (4,4,4) with the inflated stride value of 3 would be changed to
// tensor of size (2*3) +1 = 7 with the value of
// (4, 0, 0, 4, 0, 0, 4).

template<typename DataType, int DataLayout, typename IndexType>
void
test_simple_inflation_sycl(const Eigen::SyclDevice& sycl_device)
{

	IndexType sizeDim1 = 2;
	IndexType sizeDim2 = 3;
	IndexType sizeDim3 = 5;
	IndexType sizeDim4 = 7;
	array<IndexType, 4> tensorRange = { { sizeDim1, sizeDim2, sizeDim3, sizeDim4 } };
	Tensor<DataType, 4, DataLayout, IndexType> tensor(tensorRange);
	Tensor<DataType, 4, DataLayout, IndexType> no_stride(tensorRange);
	tensor.setRandom();

	array<IndexType, 4> strides;
	strides[0] = 1;
	strides[1] = 1;
	strides[2] = 1;
	strides[3] = 1;

	const size_t tensorBuffSize = tensor.size() * sizeof(DataType);
	DataType* gpu_data_tensor = static_cast<DataType*>(sycl_device.allocate(tensorBuffSize));
	DataType* gpu_data_no_stride = static_cast<DataType*>(sycl_device.allocate(tensorBuffSize));

	TensorMap<Tensor<DataType, 4, DataLayout, IndexType>> gpu_tensor(gpu_data_tensor, tensorRange);
	TensorMap<Tensor<DataType, 4, DataLayout, IndexType>> gpu_no_stride(gpu_data_no_stride, tensorRange);

	sycl_device.memcpyHostToDevice(gpu_data_tensor, tensor.data(), tensorBuffSize);
	gpu_no_stride.device(sycl_device) = gpu_tensor.inflate(strides);
	sycl_device.memcpyDeviceToHost(no_stride.data(), gpu_data_no_stride, tensorBuffSize);

	VERIFY_IS_EQUAL(no_stride.dimension(0), sizeDim1);
	VERIFY_IS_EQUAL(no_stride.dimension(1), sizeDim2);
	VERIFY_IS_EQUAL(no_stride.dimension(2), sizeDim3);
	VERIFY_IS_EQUAL(no_stride.dimension(3), sizeDim4);

	for (IndexType i = 0; i < 2; ++i) {
		for (IndexType j = 0; j < 3; ++j) {
			for (IndexType k = 0; k < 5; ++k) {
				for (IndexType l = 0; l < 7; ++l) {
					VERIFY_IS_EQUAL(tensor(i, j, k, l), no_stride(i, j, k, l));
				}
			}
		}
	}

	strides[0] = 2;
	strides[1] = 4;
	strides[2] = 2;
	strides[3] = 3;

	IndexType inflatedSizeDim1 = 3;
	IndexType inflatedSizeDim2 = 9;
	IndexType inflatedSizeDim3 = 9;
	IndexType inflatedSizeDim4 = 19;
	array<IndexType, 4> inflatedTensorRange = {
		{ inflatedSizeDim1, inflatedSizeDim2, inflatedSizeDim3, inflatedSizeDim4 }
	};

	Tensor<DataType, 4, DataLayout, IndexType> inflated(inflatedTensorRange);

	const size_t inflatedTensorBuffSize = inflated.size() * sizeof(DataType);
	DataType* gpu_data_inflated = static_cast<DataType*>(sycl_device.allocate(inflatedTensorBuffSize));
	TensorMap<Tensor<DataType, 4, DataLayout, IndexType>> gpu_inflated(gpu_data_inflated, inflatedTensorRange);
	gpu_inflated.device(sycl_device) = gpu_tensor.inflate(strides);
	sycl_device.memcpyDeviceToHost(inflated.data(), gpu_data_inflated, inflatedTensorBuffSize);

	VERIFY_IS_EQUAL(inflated.dimension(0), inflatedSizeDim1);
	VERIFY_IS_EQUAL(inflated.dimension(1), inflatedSizeDim2);
	VERIFY_IS_EQUAL(inflated.dimension(2), inflatedSizeDim3);
	VERIFY_IS_EQUAL(inflated.dimension(3), inflatedSizeDim4);

	for (IndexType i = 0; i < inflatedSizeDim1; ++i) {
		for (IndexType j = 0; j < inflatedSizeDim2; ++j) {
			for (IndexType k = 0; k < inflatedSizeDim3; ++k) {
				for (IndexType l = 0; l < inflatedSizeDim4; ++l) {
					if (i % strides[0] == 0 && j % strides[1] == 0 && k % strides[2] == 0 && l % strides[3] == 0) {
						VERIFY_IS_EQUAL(inflated(i, j, k, l),
										tensor(i / strides[0], j / strides[1], k / strides[2], l / strides[3]));
					} else {
						VERIFY_IS_EQUAL(0, inflated(i, j, k, l));
					}
				}
			}
		}
	}
	sycl_device.deallocate(gpu_data_tensor);
	sycl_device.deallocate(gpu_data_no_stride);
	sycl_device.deallocate(gpu_data_inflated);
}

template<typename DataType, typename dev_Selector>
void
sycl_inflation_test_per_device(dev_Selector s)
{
	QueueInterface queueInterface(s);
	auto sycl_device = Eigen::SyclDevice(&queueInterface);
	test_simple_inflation_sycl<DataType, RowMajor, int64_t>(sycl_device);
	test_simple_inflation_sycl<DataType, ColMajor, int64_t>(sycl_device);
}
EIGEN_DECLARE_TEST(cxx11_tensor_inflation_sycl)
{
	for (const auto& device : Eigen::get_sycl_supported_devices()) {
		CALL_SUBTEST(sycl_inflation_test_per_device<float>(device));
	}
}
